nebula-mesh: POST /api/v1/hosts/{id}/mobile-bundle response lacks Cache-Control: no-store

internal/api/mobilebundle.go:62-66 sets only Content-Type: application/yaml. The Web-UI sibling at internal/web/handlers.go:1316-1321 sets Cache-Control: no-store, Pragma: no-cache, Expires: 0, X-Content-Type-Options: nosniff — and has a test asserting it. The API path was missed. Affected All...